linux-kernel - Re: [PATCH 05/26] cxl/core: Simplify cxl_dpa_set

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Date: Fri, 5 Apr 2024 17:02:23 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Ira Weiny <ira.weiny@...el.com>, Fan Ni <fan.ni@...sung.com>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Navneet Singh <navneet.singh@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>,
 Davidlohr Bueso <dave@...olabs.net>,
 Alison Schofield <alison.schofield@...el.com>,
 Vishal Verma <vishal.l.verma@...el.com>, linux-btrfs@...r.kernel.org,
 linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/26] cxl/core: Simplify cxl_dpa_set_mode()



On 4/5/24 12:21 PM, Ira Weiny wrote:
> Dave Jiang wrote:
>>
>>
>> On 3/24/24 4:18 PM, Ira Weiny wrote:
>>> cxl_dpa_set_mode() checks the mode for validity two times, once outside
>>> of the DPA RW semaphore and again within.  The function is not in a
>>> critical path.  Prior to Dynamic Capacity the extra check was not much
>>> of an issue.  The addition of DC modes increases the complexity of
>>> the check.
>>>
>>> Simplify the mode check before adding the more complex DC modes.
>>
>> I would augment this by saying simplify "by using scope-based resource menagement".
> 
> However, using the guard cleanup is not really the simplification here.  It is
> more about checking the mode a single time.
> 
> That said I will change this to:
> 
> Simplify the mode check and convert to use of a cleanup guard.

Ok

> 
> Ira